I process product photography shots on a white sweep and need to blow out the backgrounds. Most items behave themselves when I increase the Whites value, the background clips and the product itself remains relatively unchanged. But if there's anything with saturated yellows in it the Whites slider destroys them. The magenta gets blown away and it turns into a featureless yellow mass. I really would like Whites to affect neutral tones, not highly saturated ones. I am sure there is a good reason for this behavior in other types of images, but the yellow train cars I work on have to be manually futzed with to isolate whites and yellows.